I think ROSSEL, Olivier (CIMPA) wrote:

> But such a syntax seems to fail:
> defrule doStuff ""
>   ?o <- (object (is-a FOO) (name ?name&~nil))
>   (not (foo (bar (?name trim))))
> Any comment?

In Jess, just as in all computer languages, you have to use the proper
syntax. An unadorned function call can't be a slot contraint -- that's
just the way it is. You can use a return value constraint:

 defrule doStuff ""
   ?o <- (object (is-a FOO) (name ?name&~nil))
   (not (foo (bar =(?name trim))))

I've just added just one character.

Ernest Friedman-Hill  
Advanced Software Research          Phone: (925) 294-2154
Sandia National Labs                FAX:   (925) 294-2234
PO Box 969, MS 9012                 [EMAIL PROTECTED]
Livermore, CA 94550         http://herzberg.ca.sandia.gov

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